1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
package packp
import (
"bytes"
"fmt"
"io"
"srcd.works/go-git.v4/plumbing"
"srcd.works/go-git.v4/plumbing/format/pktline"
)
const (
shallowLineLen = 48
unshallowLineLen = 50
)
type ShallowUpdate struct {
Shallows []plumbing.Hash
Unshallows []plumbing.Hash
}
func (r *ShallowUpdate) Decode(reader io.Reader) error {
s := pktline.NewScanner(reader)
for s.Scan() {
line := s.Bytes()
line = bytes.TrimSpace(line)
var err error
switch {
case bytes.HasPrefix(line, shallow):
err = r.decodeShallowLine(line)
case bytes.HasPrefix(line, unshallow):
err = r.decodeUnshallowLine(line)
case bytes.Compare(line, pktline.Flush) == 0:
return nil
}
if err != nil {
return err
}
}
return s.Err()
}
func (r *ShallowUpdate) decodeShallowLine(line []byte) error {
hash, err := r.decodeLine(line, shallow, shallowLineLen)
if err != nil {
return err
}
r.Shallows = append(r.Shallows, hash)
return nil
}
func (r *ShallowUpdate) decodeUnshallowLine(line []byte) error {
hash, err := r.decodeLine(line, unshallow, unshallowLineLen)
if err != nil {
return err
}
r.Unshallows = append(r.Unshallows, hash)
return nil
}
func (r *ShallowUpdate) decodeLine(line, prefix []byte, expLen int) (plumbing.Hash, error) {
if len(line) != expLen {
return plumbing.ZeroHash, fmt.Errorf("malformed %s%q", prefix, line)
}
raw := string(line[expLen-40 : expLen])
return plumbing.NewHash(raw), nil
}
func (r *ShallowUpdate) Encode(w io.Writer) error {
e := pktline.NewEncoder(w)
for _, h := range r.Shallows {
if err := e.Encodef("%s%s\n", shallow, h.String()); err != nil {
return err
}
}
for _, h := range r.Unshallows {
if err := e.Encodef("%s%s\n", unshallow, h.String()); err != nil {
return err
}
}
return e.Flush()
}
|
